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Nitrogen is flowing in a pipe with a of velocity 300 m/s at 500 kPa, 300°C. What is its availability relative to an ambient at 100 kPa, 20°C?

Nitrogen is flowing in a pipe with a of velocity 300 m/s at 500 kPa, 300°C. What is its availability relative to an ambient at 100 kPa, 20°C? Correct Answer 272 kJ/kg

ψ = h1 – h0 + (1/2)V^2 – T0(s1 – s0) = Cp(T1 – T0) + (1/2)V^2 – T0 = 1.042(300-20)+(300^2)/2000 – 293.15 = 272 kJ/kg.

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